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Question: 

A mixture of iron and an unknown material is bombarded with electrons. The wavelengths of the $K_\alpha$ lines are 194 pm for iron and 229 pm for the unknown. What is the unknown material?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

Chromium

Giancoli 7th Edition, Chapter 28, Problem 40

(3:80)

Chapter 28, Problem 40 is solved.

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